Al₂O₃-YAG Biphasic Composite Phase Determination Using Rietveld Method Measurements

E-ISSN： 1662-9752|2016|881|313-317

ISSN： 0255-5476

Source： Materials Science Forum, Vol.2016, Iss.881, 2017-02, pp. : 313-317

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Abstract

TheAl₂O₃-YAG biphasic composite has been extensively studied since this system has important properties such as high resistance to corrosion and creep in harsh environments. This material system is potentially very attractive for high temperatures applications. In this work, the precursor powders of Al₂O₃ and Y₂O₃, were homogenized in planetary ball mill for 2h, dried in oven at 120oC for 48h, sieved and deagglomerated. It was performed a series of heat treatments over the powder for verification of the YAG phase formation, using1100, 1200, 1300°C and 1400 °C for 3.0 h time. The powders of the starting mixture after grinding and calcinations were characterized for phase quantification using the Rietveld method. The complete formation of the YAG phase in the composite was determined at1300°C after 3h.